Stringers interface in Go
One of the most common interfaces is Stringer defined by the fmt package:
1type Stringer interface {
2 String() string
3}A Stringer is a type that can describe itself as a string. The fmt package look for this interface to print values.
E.g.:
1package main
2
3import "fmt"
4
5type Person struct {
6 Name string
7 Age int
8}
9
10func (p Person) String() string {
11 return fmt.Sprintf("%v (%v years)", p.Name, p.Age)
12}
13
14func main() {
15 a := Person{"Arthur Dent", 42}
16 z := Person{"Zaphod Beeblebrox", 9001}
17 fmt.Println(a, z)
18}
19
20// Output:
21// Arthur Dent (42 years) Zaphod Beeblebrox (9001 years)
References
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